diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
index b2ffc82ed2d..faa2837fa01 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c
@@ -978,7 +978,7 @@ static void emit_wpos_xy(struct brw_wm_compile *c,
 	brw_ADD(p,
 		dst[0],
 		retype(src0[0], BRW_REGISTER_TYPE_W),
-		brw_imm_d(- c->key.origin_x));
+		brw_imm_d(0 - c->key.origin_x));
     }
 
     if (mask & WRITEMASK_Y) {